From ALT Linux Wiki

Writing hybrid ISO images to boot media

It's not recommended to use UNetbootin, Rufus or UltraISO as these are too "smart" and actually cripple the resulting media to barely bootable or even unbootable state.

It is recommended to use the following utilities.

Optical media

  • Linux: K3b and similar frontends to cdrecord/growisofs
  • Windows: Nero BurningROM or similar

USB Flash drives

Please do care to doublecheck and select the proper target device or your hard drive might get overwritten!